appropriating Shailen's excellent Futures intro into tutorial

src/site/docs/tutorials/forms/index.markdown

Index: src/site/docs/tutorials/forms/index.markdown
diff --git a/src/site/docs/tutorials/forms/index.markdown b/src/site/docs/tutorials/forms/index.markdown
index 03723b8635a35e8205d83598aa3a48c400eb2bf1..ce1c3da12c755d598534210a362afbd871a820b6 100644
--- a/src/site/docs/tutorials/forms/index.markdown
+++ b/src/site/docs/tutorials/forms/index.markdown
@@ -62,16 +62,17 @@ The client uses Polymer to present its user interface
 (a form with many kinds of input elements),
 and keep the interface in sync with Dart data.
 The client and server communicate using
-several classes from the core Dart library,
+several classes from various Dart libraries,
 including streams, Futures, HttpRequest, and so on.
 The server uses CORS headers to allow cross-origin requests.
 
 <aside class="alert alert-info" markdown="1">
   <strong>Note:</strong>
   This tutorial assumes that you have read
-  [Define a Custom Element](/docs/tutorials/polymer-intro/)
+  [Define a Custom Element](/docs/tutorials/polymer-intro/),
+  [Use Future Based APIs](/docs/tutorials/futures/),
   and [Fetch Data Dynamically](/docs/tutorials/fetchdata/)
-  and are familiar with Polymer, JSON, and HttpRequest.
+  and are familiar with Polymer, Futures, JSON, and HttpRequest.
 </aside>